Abstract
Estimates exact in order are obtained in the uniform and integral metrics for the deviation of partial sums of double series of exponents that represent functions which are regular on products of convex polygons and either continuous on a product of closed polygons or belonging to the Smirnov class.
References
Yu. I. Mel'nik, “On the rate of convergence of series of exponents representing functions regular on convex polygons,”Ukr. Mat. Zh.,37, No. 6, 719–722 (1985).
Yu. I. Mel'nik, “Direct theorems on approximation of functions regular on convex polygons by exponential polynomials in the integral metric,”Ukr. Mat. Zh.,40, No. 5, 584–597 (1988).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 46, No. 9, pp. 1271–1274, September, 1994.
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Mel'nik, Y.I. On the rate of convergence of double series of exponents representing regular functions on products of convex polygons. Ukr Math J 46, 1399–1403 (1994). https://doi.org/10.1007/BF01059431
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DOI: https://doi.org/10.1007/BF01059431